Lock



FIG. 1 is a front top perspective view of a lock shown in the locked position of the new design;

FIG. 2 is a rear bottom perspective view of a lock shown in the locked position of the new design;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a left-side elevation view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM The ornamental design for a lock, as shown and described. 